Resideo L4064B2236 Controller

The Resideo L4064B2236 Controller is a heavy-duty fan and limit controller designed for forced warm air heating systems. This unit features an 8-inch helical bimetal element sensing probe that provides accurate temperature control by making the fan circuit and breaking the high-limit circuit on temperature rise. Engineered for versatility, it supports high-limit settings between 100°F and 250°F and adjustable fan-on cycles from 65°F to 215°F. The honeywell fan limit switch replacement is built to withstand demanding mechanical rooms, rated for 190°F ambient at the switch and up to 350°F at the element. With a 25°F high-limit differential, it prevents rapid cycling and ensures system safety. This model serves as a direct replacement for L4064A2030, 8620-081, and CNT2542, offering a universal mounting bracket for fast field installation. It is a critical component for maintaining secondary heat exchanger safety and optimizing blower motor cycles in residential and light commercial furnaces.

• Universal Compatibility: Includes hardware for surface or bracket mounting to replace various OEM limit controls.
• Precise Thermal Sensing: 8-inch element insertion depth ensures optimal placement within the plenum for HVAC furnace limit switch accuracy.
• Manual Fan over-ride: Features a manual fan switch to provide continuous blower operation during troubleshooting or seasonal ventilation.
• High Ambient Tolerance: Designed to operate reliably in high-heat environments common in aging or high-efficiency forced-air systems.

Common Questions

What are the wiring requirements for the L4064B2236?
This controller uses standard push-in terminals for quick connection and includes a brass jumper that can be removed for use in low-voltage or line-voltage limit circuits.

Can this replace a shorter element limit switch?
While the 8-inch probe offers better sensing in many plenums, always verify clearance within the furnace cabinet to ensure the element does not contact heat exchangers or internal baffles.

How do I set the fan-off temperature?
The furnace fan limit control settings are adjusted via movable pointers on the scaleplate. The fan-off setting should typically be high enough to prevent blowing cold air at the end of a heating cycle.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.